Check Engine Light Diagnosis

The Purpose of the Check Engine Light

The check engine light is a crucial part of your Volvo's onboard diagnostics system. Whenever the onboard computers sense a problem that requires attention, such as an engine knock or overheating, your Volvo's engine control module, sometimes known as an engine control unit or powertrain control module, triggers the check engine light. The ECM also stores a trouble code that one of our mechanics will later retrieve and read with the help of an OBD scanner. By deciphering the trouble code, our certified technicians are able to pinpoint the issue and correct it within a timely manner.

Issues That Trigger the Check Engine Light

The check engine light can be triggered by any number of issues. Some of these can be as minor as a loose gas cap or a disconnected sensor. On the other hand, major issues such as misfires, overheating and stability control issues can also trigger a check engine light. You'll also see a check engine light if your Volvo suffers from emissions-related issues, such as a bad catalytic converter or a failed oxygen sensor. Whenever you see a check engine light on your dashboard, your best bet is to have one of our technicians at Bergeron Volvo Cars take a closer look.

What's the Difference Between a Steady and Flashing Check Engine Light?

Check engine lights can show up in two different ways: as a steadily illuminated light or a flashing light. If the check engine light appears and stays illuminated, then chances are the issue is minor but should still be diagnosed as soon as possible. If the check engine light flashes, however, then you should bring your vehicle in immediately for service. Misfires and other issues that could cause serious damage to your engine can trigger a flashing check engine light.